摘要
Abstract
The triaxial compress tests of soft soils under consolidation by three preloading methods of vacuum, surcharge, combined vacuum-surcharge are performed, and the SEM photos are taken before and after the tests from up, middle and bottom of soil samples which describe the microstructural changes in the different preloading methods: Reinforcement effects and mechanisms of three preloading methods are analyzed with the micromechanics, macroscopic engineering properties of soils, and combination of both. The relationship between changes of microstructural index and engineering characteristic of soft soil are studied. The results show that: The microstructure of soil has remarkable change after the precompression load reinforcement. The changes in the microstructure parameters consistent with their way of preloading, and are relative closely to the changes of macroscopic parameters of the soils. Index changes of both macroscopic properties and microstructure indicate that combined effect of preloading is the best, followed by vacuum preloading, the smallest is surcharge preloading. The experiment result which means that the macro-engineering behavior of soil is essentially determined by the microstructure.关键词
真空—堆载联合预压/软土/微观结构/加固机理Key words
Vacuum-surcharge combined preloading/Soft soil/Microstructure/Reinforcement mechanism分类
建筑与水利
